Yeah, I never took the comics to imply that there were only 13 colony ships (aka Titans) ever. By the same token, I don't think the 13 colony ships have to align with the 13 tribes. For example, just because the Camiens worship Solus over the others, doesn't mean that Caminus, the titan, had to be commissioned or carry Solus herself. Now, it could be. Caminus could have been Solus' ship and/or servant and all the Camiens "realated" to her somehow. But I hope the comics will avoid that "planet of hats" model of sci-fi and allow each colony to be more diverse than that.